Thanks for the reply. If we want to have PV kernel for CentOs 7 , are there any guidelines to follow? How we can know before hand itself that this kernel is PV or HVM, without installing kernel? On Wed, Aug 19, 2015 at 11:27 AM, John R Pierce <pierce at hogranch.com> wrote: > On 8/18/2015 10:37 PM, Venkateswara Rao Dokku wrote: > >> Thanks for the reply. >> Sorry for the typo in the earlier mail. >> I have PV-HVM of CentOS 7 & I need to convert it to PV kernel. >> >> Basically here I am trying to see whether my PV_HVM kernel is vulenrable >> to >> this issue given in the following link >> http://seclists.org/oss-sec/2015/q3/212 >> > > > that is talking about a problem with QEMU and emulated cdroms, and as far > as I can tell, the bug is in the qemu emulator, not in the VM's. it > merely states that if you only use PV VM's you won't trigger the bug, but > the correct fix is to update your QEMU so there is no bug. > > > In the above link, it was mentioned that the PV kernel is not vulnerable to >> this bug, but HVM is. It didnt say anything about PV-HVM. >> >> Can you please help me in this regard? >> > > https://access.redhat.com/security/cve/CVE-2015-5154 suggests QEMU has > been fixed as of July 27/28, at least for KVM servers, see the 4 RHSA > Errata linked there. > > again, RHEL7 and therefore CentOS 7 is all about KVM not Xen. > > If you're running someone's xen server, you need to ensure its patched > against this bug. > > > -- > john r pierce, recycling bits in santa cruz > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Thanks & Regards, Venkateswara Rao Dokku.